Wellesley Island, NY is a city located in Jefferson County, New York and has a land area of 12.32 square miles (31.91 km2). The water area for the city is 6.59 square miles or 17.07 km2. There is one unique zip code in Wellesley Island, New York and it is 13640. The area code(s) for Wellesley Island is 315.
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